CN219892278U

CN219892278U - End cover assembly and battery thereof

Info

Publication number: CN219892278U
Application number: CN202320213086.0U
Authority: CN
Inventors: 林亮文
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-02-13
Filing date: 2023-02-13
Publication date: 2023-10-24
Anticipated expiration: 2033-02-13

Abstract

The utility model discloses an end cover assembly and a battery thereof, wherein the end cover assembly comprises: the end cover main body is provided with a liquid injection hole and is provided with an inner side surface close to the electrode assembly; the first insulating piece is arranged on the inner side surface, the first insulating piece is provided with a flow dividing piece, the flow dividing piece is provided with one or more overflow holes, and the liquid injection hole is positioned in a projection area of the flow dividing piece on the inner side surface. The end cover assembly can relieve the impact of electrolyte on the electrode lugs or the electrode groups, so that the risks of impact tearing, electrode group impact blanking, diaphragm impact inward folding and the like of the electrode lugs are reduced, and meanwhile, the overflow of the electrolyte is avoided, and the electrolyte is soaked more uniformly and rapidly.

Description

End cover assembly and battery thereof

Technical Field

The utility model relates to the technical field of batteries, in particular to an end cover assembly and a battery thereof.

Background

Under the dual pressures of environmental deterioration and resource shortage, new energy sources accelerate the development. Although development and utilization of new energy sources such as wind energy and solar energy are attracting attention, renewable green energy sources have variability, transiently and discontinuously, and lithium ion batteries are attracting attention in the development of new energy sources due to the advantages of high energy density, long cycle life, small environmental pollution, high recyclability and the like.

The lithium ion battery is used as core power in the new energy electric automobile and mainly comprises a positive electrode, a negative electrode, a diaphragm, electrolyte, a shell and the like, wherein the electrolyte mainly plays a role in lithium ion transmission. In the cell cost, the electrolyte cost is higher than the ratio, however, in the cell manufacturing process, electrolyte overflow exists when the cell is filled, so that the manufacturing cost is increased, and the overflowed electrolyte also contaminates the cover plate, the polar column and the explosion-proof valve, so that the safety risk is caused.

Common cover plate designs are provided with a liquid injection hole direct pair pole group, a liquid injection hole direct pair pole lug and the like, but part of the common cover plate designs are not designed aiming at the problem of overflow liquid, the damage to the pole lug or the pole group caused by stamping during liquid injection is not considered, and most of the common cover plate designs are also not considered for the uniformity of electrolyte infiltration during liquid injection.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an objective of the present utility model is to provide an end cap assembly to solve the problem of damage to the tab or the pole group caused by stamping during electrolyte overflow and electrolyte injection in the prior art.

The utility model also aims to provide a battery, so that the end cover assembly can be applied.

An end cap assembly according to an embodiment of the present utility model includes: the liquid injection device comprises an end cover main body, a liquid injection hole and a liquid injection hole, wherein the end cover main body is provided with an inner side surface close to an electrode assembly; the first insulating piece is arranged on the inner side face, the first insulating piece is provided with a flow dividing piece, the flow dividing piece is provided with one or more overflow holes, and the liquid injection holes are located in a projection area of the flow dividing piece on the inner side face.

According to the end cover assembly provided by the embodiment of the utility model, the first insulating piece is provided with the shunt piece, and the shunt piece is provided with the one or more overflow holes, wherein the liquid injection holes are positioned in the projection area on the inner side surface of the shunt piece, so that risks of impact tearing, pole group impact blanking, diaphragm impact inward folding and the like of the pole lugs are reduced, and meanwhile, electrolyte overflow is avoided, and electrolyte infiltration is more uniform and rapid.

In some embodiments, the flow divider includes a first portion extending along a first direction, the plurality of overflow apertures being arranged in an array on the first portion along the first direction at least in part.

In some embodiments, the end cap body is provided with a positive electrode post and a negative electrode post, and one end of the first portion extends to be adjacent to the positive electrode post, and the other end extends to be opposite to the negative electrode post.

In some embodiments, the first direction and the length direction of the end cap body remain the same.

In some embodiments, the flow divider further includes a second portion extending in a second direction, and the remainder of the plurality of overflow apertures other than the first portion are arranged in an array on the second portion in the second direction.

In some embodiments, the second direction and the width direction of the end cap body remain the same.

In some embodiments, the flow splitter has a flow trough formed therein, and one or more of the overflow apertures are provided in a bottom wall of the flow trough.

In some embodiments, a fluid channel is defined between the shunt member and the first insulating member, and one or more of the overflow apertures are provided in a bottom wall of the fluid channel.

In some embodiments, the diameter of the liquid injection hole is 2 mm-5 mm.

The battery comprises the end cover assembly. Therefore, the manufacturing period of the battery is shortened, and the service life of the battery is prolonged.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a cross-sectional view of an end cap assembly in an embodiment of the utility model;

FIG. 2 is an enlarged view of section I of FIG. 1 in accordance with the present utility model;

fig. 3 is a bottom view of an end cap assembly in an embodiment of the utility model.

Reference numerals:

100. an end cap assembly;

10. an end cap body; 101. a liquid injection hole;

20. a first insulating member;

30. a shunt; 301. a first portion; 3011. a fluid passage; 3012. an overflow aperture; 302. a second portion;

40. a positive electrode post;

50. and a negative electrode column.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center," "length," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly, for distinguishing between the descriptive features, and not sequentially, and not lightly.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring now to fig. 1-3, an end cap assembly 100 according to an embodiment of the present utility model is described.

As shown in fig. 1, an end cap assembly 100 according to an embodiment of the present utility model includes: an end cap body 10, a first insulating member 20, and a shunt member 30.

The end cover main body 10 is provided with a liquid injection hole 101, and the end cover main body 10 is provided with an inner side surface close to the electrode assembly; the first insulating member 20 is disposed on the inner side surface, the first insulating member 20 is provided with a flow dividing member 30, and the flow dividing member 30 is provided with one or more overflow holes 3012, wherein the liquid injection holes 101 are located in a projection area of the flow dividing member 30 on the inner side surface.

It can be understood that in the prior art, when the liquid is injected through the liquid injection hole in the end cover main body, the stamping during the liquid injection can damage the tab or the pole group. In order to solve the problem, the current divider 30 is arranged on the first insulating member 20, the current divider 30 and the first insulating member 20 can be integrally arranged, the current divider 30 is provided with the overflow hole 3012, the overflow hole 3012 is arranged below the projection area of the liquid injection hole 101, and when electrolyte is injected through the liquid injection hole 101, the electrolyte flows into the overflow hole 3012 from the liquid injection hole 101, so that the purpose of dispersing the electrolyte is realized, the electrolyte cannot directly flow into the tab or the tab group, and the risks of impact tearing, tab group impact blanking, diaphragm impact inward folding and the like of the tab are reduced. The first insulating member 20 and the shunt member 30 may be made of the same material, for example, PC polycarbonate, and may be welded to the end cap body 10.

According to the end cover assembly 100 of the embodiment of the utility model, the first insulating member 20 is provided with the flow dividing member 30, and the flow dividing member 30 is provided with one or more overflow holes 3012, wherein the liquid injection holes 101 are positioned in the projection area on the inner side surface of the flow dividing member 30, so that risks of impact tearing, pole group impact blanking, diaphragm impact inward folding and the like of the pole lugs are reduced, and meanwhile, electrolyte overflow is avoided, and electrolyte infiltration is more uniform and rapid.

In some embodiments, referring to fig. 3, the flow splitter 30 includes a first portion 301, the first portion 301 extending along a first direction, the plurality of overflow apertures 3012, at least a portion of the plurality of overflow apertures 3012 being arranged in an array on the first portion 301 along the first direction. It is understood that by providing a plurality of overflow holes 3012 arranged in an array, the electrolyte is better dispersed into the plurality of overflow holes 3012, and the impact to the tab is reduced. The first direction and the longitudinal direction of the cap body 10 are kept the same, and the "first direction" specifically refers to the left-right direction in fig. 3.

In some embodiments, referring to fig. 1, the end cap body 10 is provided with a positive post 40 and a negative post 50, and the first portion 301 extends from one end to the positive post 40 and from the other end to the negative post 50. It can be understood that the first portion 301 is provided with a plurality of overflow holes 3012, that is, the overflow holes 3012 are disposed from the position close to the positive electrode post 40 to the position close to the negative electrode post 50, so that the electrolyte flowing from the liquid injection hole 101 is dispersed, and both sides of the positive electrode and the negative electrode can be simultaneously infiltrated, so as to shorten the infiltration time of the electrolyte.

In some embodiments, referring to fig. 3, the flow splitter 30 further includes a second portion 302, the second portion 302 extending in a second direction, and the remainder of the plurality of overflow apertures 3012, except over the first portion 301, are arranged in an array over the second portion 302 in the second direction. It can be understood that the second portion 302 is provided with a plurality of overflow holes 3012, that is, the overflow holes 3012 are all arranged in the front-to-back direction, so that the electrolyte flowing from the liquid injection hole 101 is further dispersed, the impact on the tab is reduced, and the infiltration efficiency of the electrolyte is improved. The second direction and the width direction of the cap body 10 are kept the same; the "second direction" specifically refers to the front-rear direction in fig. 3.

In some embodiments, the flow splitter 30 has a flow channel (not shown) formed therein and one or more overflow apertures 3012 are provided in the bottom wall of the flow channel. It can be understood that after the electrolyte is injected from the injection hole 101, the electrolyte flows along the launder, meanwhile, the overflow hole 3012 is arranged on the bottom wall of the launder, and part of the electrolyte flows out of the overflow hole 3012 in the process of flowing along the launder, so that the electrolyte is dispersed, and the impact force to the tab is reduced.

In some embodiments, referring to fig. 1 and 2, a flow channel 3011 is defined between the shunt member 30 and the first insulating member 20, and one or more overflow holes 3012 are provided in a bottom wall of the flow channel 3011. It can be understood that the shunt member 30 and the first insulating member 20 may be integrally formed, but a fluid channel 3011 is formed therebetween, when the electrolyte is injected from the injection hole 101, the electrolyte flows along the fluid channel 3011, meanwhile, an overflow hole 3012 is formed in the bottom wall of the fluid channel 3011, and part of the electrolyte flows out of the overflow hole 3012 during the flowing along the fluid channel 3011, so as to disperse the electrolyte and reduce the impact force of the tab.

In some embodiments, the diameter of the injection hole 101 is 2mm to 5mm. The diameter of the pouring orifice 101 may be any value within a range of 2mm to 5mm, and may be, for example, 2mm, 3mm, 4mm, 5mm, or the like.

A battery according to an embodiment of the present utility model includes the end cap assembly 100 described above. Therefore, the manufacturing period of the battery is shortened, and the service life of the battery is prolonged.

One specific embodiment of an end cap assembly 100 of the present utility model is described below with reference to the accompanying drawings.

Referring to fig. 1-3, an end cap assembly 100 includes: an end cap body 10, a first insulating member 20, and a shunt member 30.

The end cover main body 10 is provided with a liquid injection hole 101, and the end cover main body 10 is provided with an inner side surface close to the electrode assembly; the first insulating member 20 is disposed on the inner side surface, the first insulating member 20 is provided with a flow dividing member 30, and the flow dividing member 30 is provided with a plurality of overflow holes 3012, wherein the liquid injection holes 101 are located in a projection area of the flow dividing member 30 on the inner side surface.

The flow divider 30 includes a first portion 301 and a second portion 302, the first portion 301 extending along a first direction, the plurality of overflow apertures 3012, and portions of the plurality of overflow apertures 3012 being arranged in an array on the first portion 301 along the first direction. The end cap body 10 is provided with a positive electrode column 40 and a negative electrode column 50, and one end of the first portion 301 extends toward the positive electrode column 40 and the other end extends toward the negative electrode column 50. The first direction and the length direction of the cap body 10 remain the same. The second portion 302 extends in a second direction, and the remainder of the plurality of overflow apertures 3012, excluding the first portion 301, is arranged in an array in the second direction on the second portion 302. The second direction and the width direction of the cap body 10 remain the same.

The flow divider 30 has a flow channel formed therein, and a plurality of overflow holes 3012 are provided in the bottom wall of the flow channel. A fluid passage 3011 is defined between the shunt member 30 and the first insulating member 20, and a plurality of overflow holes 3012 are provided in the bottom wall of the fluid passage 3011. The diameter of the pouring orifice 101 is 3mm.

In the description of the present specification, reference to the terms "some embodiments," "optionally," "further," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. An end cap assembly, comprising:

the liquid injection device comprises an end cover main body, a liquid injection hole and a liquid injection hole, wherein the end cover main body is provided with an inner side surface close to an electrode assembly;

the first insulating piece is arranged on the inner side face, the first insulating piece is provided with a flow dividing piece, the flow dividing piece is provided with one or more overflow holes, and the liquid injection holes are located in a projection area of the flow dividing piece on the inner side face.

2. The end cap assembly of claim 1, wherein the flow splitter comprises a first portion extending in a first direction, the plurality of overflow apertures being arranged in an array on the first portion at least partially along the first direction.

3. The end cap assembly of claim 2, wherein the end cap body has a positive post and a negative post, and wherein one end of the first portion extends toward the positive post and the other end extends toward the negative post.

4. The end cap assembly of claim 2 or 3, wherein the first direction and the length direction of the end cap body remain co-directional.

5. The end cap assembly of claim 2, wherein the flow splitter further comprises a second portion extending in a second direction, the remainder of the plurality of overflow apertures other than the first portion being arranged in an array on the second portion in the second direction.

6. The end cap assembly of claim 5, wherein the second direction and the width direction of the end cap body remain co-directional.

7. The end cap assembly of claim 1, wherein the flow splitter has a flow channel formed therein and one or more of the overflow apertures are provided in a bottom wall of the flow channel.

8. The end cap assembly of claim 1, wherein the flow divider and the first insulator define a flow channel therebetween, and wherein one or more of the overflow apertures are provided in a bottom wall of the flow channel.

9. The end cap assembly of claim 1, wherein the injection port has a diameter of 2mm to 5mm.

10. A battery comprising the end cap assembly of any one of claims 1-9.